class SimpleCov::SourceFile

def covered_percent

The coverage for this file in percent. 0 if the file has no relevant lines 
def covered_percent
  return 100.0 if lines.length.zero? || lines.length == never_lines.count
  relevant_lines = lines.count - never_lines.count - skipped_lines.count
  if relevant_lines.zero?
    0.0
  else
    Float(covered_lines.count * 100.0 / relevant_lines.to_f)
  end
end